'Forage!' and they alighted and scattered about to feed, while two of the permanent sentries mounted duty--one on a tree to the right, the other on a mound to the far left. A minute or two later Silverspot would cry out, 'A man with a gun!' The sentries repeated the cry and the company flew at once in open order as quickly as possible toward the trees. Once behind these, they formed line again in safety and returned to the home pines. Sentry duty is not taken in turn by all the crows, but a certain number whose watchfulness has been often proved are the perpetual sentries, and are expected to watch and forage at the same time. Rather hard on them it seems to us, but it works well and the crow organization is admitted by all birds to be the very best in existence. Finally, each November sees the troop sail away southward to learn new modes of life, new landmarks and new kinds of food, under the guidance of the everwise Silverspot. III There is only one time when a crow is a fool, and that is at night. There is only one bird that terrifies the crow, and that is the owl. When, therefore, these come together it is a woeful thing for the sable birds. The distant hoot of an owl after dark is enough to make them withdraw their heads from under their wings, and sit trembling and miserable till morning. In very cold weather the exposure of their faces thus has often resulted in a crow having one or both of his eyes frozen, so that blindness followed and therefore death. There are no hospitals for sick crows. But with the morning their courage comes again, and arousing themselves they ransack the woods for a mile around till they find that owl, and if they do not kill him they at least worry him half to death and drive him twenty miles away. In 1893 the crows had come as usual to Castle Frank. I was walking in these woods a few days afterward when I chanced upon the track of a rabbit that had been running at full speed over the snow and dodging about among the trees as though pursued. Strange to tell, I could see no track of the pursuer. I followed the trail and presently saw a drop of blood on the snow, and a little farther on found the partly devoured remains of a little brown bunny. What had killed him was a mystery until a careful search showed in the snow a great double-toed track and a beautifully pencilled brown feather. Then all was clear--a horned owl. Half an hour later, in passing again by the place, there, in a tree, within ten feet of the bones of his victim, was the fierce-eyed owl himself. The murderer still hung about the scene of his crime. For once circumstantial evidence had not lied. At my approach he gave a guttural 'grrr-oo' and flew off with low flagging flight to haunt the distant sombre woods.